Added default stats object to email model

- The serialized object is meant to serve as a placeholder for future email related stats pooled from mail service provider

core/server/models/email.js

@@ -7,7 +7,15 @@ const Email = ghostBookshelf.Model.extend({
     defaults: function defaults() {
         return {
             uuid: uuid.v4(),
-            status: 'pending'
+            status: 'pending',
+            stats: JSON.stringify({
+                delivered: 0,
+                failed: 0,
+                opened: 0,
+                clicked: 0,
+                unsubscribed: 0,
+                complaints: 0
+            })
         };
     },
 

core/test/acceptance/admin/emails_spec.js

@@ -33,6 +33,15 @@ describe('Email API', function () {
                 should.exist(jsonResponse.emails);
                 jsonResponse.emails.should.have.length(1);
                 localUtils.API.checkResponse(jsonResponse.emails[0], 'email');
+
+                const stats = JSON.parse(jsonResponse.emails[0].stats);
+
+                should.exist(stats.delivered);
+                should.exist(stats.failed);
+                should.exist(stats.opened);
+                should.exist(stats.clicked);
+                should.exist(stats.unsubscribed);
+                should.exist(stats.complaints);
             });
     });
 });

core/test/utils/fixtures/data-generator.js

@@ -425,7 +425,6 @@ DataGenerator.Content = {
             id: ObjectId.generate(),
             uuid: '6b6afda6-4b5e-4893-bff6-f16859e8349a',
             status: 'submitted',
-            stats: '',
             email_count: 2,
             subject: 'You got mailed!',
             html: '<p>Look! I\'m an email</p>',